Sony’s set to re-enter the reader market as soon as one month from now, supposedly releasing revamped and updated versions of its devices even before the new S1 and S2 tablets.

Sony’s had readers on the market for years now, but consumers have largely forgotten about their existence–despite the sleek look and reasonable pricing of the devices themselves. This new push comes at a time when competing readers are making the transition to full-fledged tablets, like Amazon’s Kindle. Contrary to Amazon, Sony wants to keep its readers as readers, and its tablets as tablets (but that won’t stop them from including its e-book store in the S1 and S2).

That reasoning makes sense, considering the fact that Sony’s new tablets are assumed to carry big price tags. One of the biggest draws of an e-reader is, after all, the fact that you can snag one for less than $300, and Sony doesn’t plan to change that for its upgraded models.

The news of a revamp also answers the question of why Sony’s more advanced readers are out of stock at its own website.

Previously, Sony offered three versions of its reader, ranging from “pocket” (cheap) to “daily” ($300 and full-featured). Unfortunately, there’s no word yet on how upgraded the new models will be, but with the Kindle now cruising 3G, it’s a definite possibility that at least one model will (re)launch with similar services already in play.

Pushing its e-book store in other venues is nearly as important as putting new readers on the market, so it’s no surprise that they’re already talking about its use in the coming S1 and S2 tablets. What they’re not yet talking about is making the store available as an app for other Android tablets, which would only makes sense. The S1 and S2 are both running Android Honeycomb, and Amazon’s Kindle app has been available for over a month now on the Android Market.

Since Sony’s already begun populating the market with apps for Experia and sub-brands like Sony Pictures, it’s probably just a matter of time before the Reader Store has an app, too.